材料化学性质影响微生物污垢的神经网络分析

用神经网络技术对微生物垢诱导期和平均污垢量建立了评价及预测模型。对文献及作者实验获得的共 18个样本进行了拟合评价 ,结果表明 ,对诱导期 18个样本的评价结果与实测结果全部相符合 ,准确率达到 10 0 % ;对平均污垢量 ,有 15个样本的评价结果与实测结果相符合 ,准确率达到 83.3%。对 5个样本进行了预测 ,结果表明 ,对诱导期和平均污垢量 ,均有 4个样本的预测结果与实测结果相符 ,准确率达到 80 %。

用处理过的污水作炼油厂冷却水补水时微生物垢的控制

实践表明，在敞开蒸发式冷却水系统中，微生物的控制对腐蚀和沉积物的形成是一重要因素。补水水质对循环冷却水中的微生物活性也有影响。本文通过炼厂冷却水系的二个冷却水化学处理方案讨论了这一实践。该冷却水系统使用了城市污水处理厂的处理后的污水作为补水。给出了现场结果，比较了二种方案在控制微生物垢方面的效果，给出了整个冷却水系统的最低腐蚀率和结垢情况。

交叉缩放椭圆管中微生物污垢特性

【目的】为研究微生物污垢在换热表面的沉积规律,实验研究了交叉缩放椭圆管与光管的微生物污垢的沉积特性。【方法】实验以松花江水中分离纯化出的铁细菌为菌种,利用污垢动态模拟试验系统,采用对比的试验方法研究了铁细菌在工业运行环境下流速及水质参数的变化对表面污垢行程的影响。【结果】由于交叉缩放椭圆管的强化湍流作用,使交叉缩放椭圆管内污垢沉积量小于光管;水的流速越大,换热管内铁细菌平均沉积量越小;交叉缩放椭圆管内工质pH、电导率随微生物污垢的沉积先升高、然后趋于平缓;而二价铁离子含量、COD值、溶解氧含量随微生物污垢的沉积逐渐下降。【结论】交叉缩放椭圆管的抗垢性能优于光管;微生物污垢形成对冷却水水质参数的变化影响明显。

某海上油田混输海管腐蚀原因分析及防腐措施研究

选用某海上油田已运行7 a的外输海底海管,通过分析防腐工艺、运行工况、现场挂片、内检测数据、清管垢样和细菌检测结果,开展腐蚀原因分析。结果表明,腐蚀主因是垢下微生物腐蚀,FeCO_(3)沉积为SRB等细菌的滋生提供了环境,微生物腐蚀及流体中的H_(2)S导致金属发生腐蚀。本文结合这条海管的情况给出防腐措施建议,为此类型海管的腐蚀防护提供借鉴。

Microbial Biofilm Formation as a Dental-fouling Microorganisms Attachment Phenomenon in Oral Cavity Environment

DMFP （Dental microbial fouling phenomenon） of OCE （oral cavity environment） was studied in the local dental labs. Multi-smears of mature supra gingival plaques were randomly collected from fifty persons in dental labs that had different cultures, ages, sex and different scientific levels. Rapid microbial identification method was used to identify of these multi-smears by using vitek-2 compact instrument. The most frequent and appearance species of bacteria was Pantoeae spp., then Klebsiella pneumonia. Total species of microbial fouling in supra gingival plaques were included sixteen species： Staphyllococcus aureus, Klebsiella pneumonia, Pantoeae spp., Aercococcus viridians, Leuconostoc mesenteroides cremorise, Granuli.adiacens, Streptococcus sanguinis, Staphyllococcus sciuri, Stenotrophomonus maltiphilia, Kocuria varians, Gememlla morbillorum, Granulicatella adiacens, Nonreac biopattern, Kocuria kritinae, Kocuria rosea and Nonreac.biopattern while six fungal species were Tricoderma viride, Aspergillus flavus, Tricoderma harzianum, Cladosporium macrocarpum, Penicillium citrinum and Verticillium lecanii in addition to two yeast species were recorded Candida dubliniensis and Candida glabrata. The results were detected the most appearance of bacteria Pantoeae sp., then Klebsiella pneumonia, then Staphyllococcus aureus. These results of study suggest that adhesive strength conjugated with the biofilm layers presence in OCE may vary across different from one to other persons and mark a new path of inquiry for dental Microbial-fouling phenomenon research.